Solve 3*d + 31 = -u + 36, 4*u + d = -2 for u.
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What is the l'th term of 61, 56, 51, 46, 41, 36?
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What is the o'th term of 193, 196, 201, 208?
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What is the n'th term of 16, 49, 98, 169, 268, 401, 574?
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What is the r'th term of 135, 129, 109, 69, 3, -95, -231?
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What is the s'th term of 37, 14, -9, -32, -55, -78?
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What is the i'th term of 150, 152, 154, 156, 158?
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